Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ECH callsign genealogy
Currently held by Harkness, Eric C
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K4ECH's current licensee, walking backwards.
- Harkness, Eric CAZgranted 2013-01-11cancelled 2013-01-29
Successor callsigns
Callsigns held now by people who previously held K4ECH.
- Harkness, Eric CAZgranted 2025-02-14
All historical holders
Every license row we've seen with the callsign K4ECH, oldest first.
- JAREMKO, LEO L FL1995-01-31 → cancelled 2007-02-01
- Harkness, Eric C AZ2022-11-02 → cancelled 2025-02-14